3M Marine Grade Silicone Sealant, 08027, For Boats and RVs, Above the Waterline Interior/Exterior Sealing, White, 10.3 fl oz Cartridge

Very strong. I water proofed around the rv windows.

This product is OK!. It kinda gets the job however its too thick to come out of that small tube. Also, you need to lay down a plastic bag bc it will be messy. The good thing about getting messy is that its Silicone. You can easily pull it off. Plus the tube burst at the end and I didn't get a chance to use the whole tube.

Very nice product, and does what it is supposed to do. I would buy again if I have to.

Silky with easy application and clean up was a breeze.

Great product and solved leak in RV roof. Clean up was messy so use disposable gloves.

Used this stuff for years for a variety of things; gutters, metal roof leaks around screws, cracked pipes, etc. Adheres well and is truly water tight when not under pressure.

After puncturing the seal, you have 24 hours (at most) to use the entire tube. Whatever is left after that, you must throw away. That's what the label says.V E R Y W A S T E F U L ! ! !The manufacturer should package several smaller tubes instead of a single big one that must all be thrown away after using.Limitations :- Sealant should be used within 24 hours after inner seal is punctured, as product will start to cure in the cartridge and nozzle.- Alcohol should not be used in preparation for bonding as it will interfere with the curing process, causing the adhesive to fail.- Due to the decreased value in bond strength at elevated temperatures use of this product is not recommended above 190°F (88°C).- Do not apply at temperatures below 40°F (4°C) or on frost covered surfaces. Do not apply at surface temperatures above 100°F (38°C).- Cannot be painted.- Marine Grade Silicone Sealant is not recommended for use as a teak deck seam sealer. Extended exposure to chemicals (teak cleaners, oxalic acid, gasoline, strong solvents and other harsh chemicals) may cause permanent softening of the sealant.- Marine Grade Silicone Sealant is not recommended for the installation of glass, polycarbonate, or acrylic windows that are not also mechanically fastened.- Do not use with electronic circuitry. Acetic acid liberated during cure may corrode electronic circuitry.

Used it to seal a plaque on an outdoor sign works like a champ. Not for permanent underwater use but easily handles rain and exterior weather climate with no problems. Love it would buy it again.